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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceaeca4aa50852d086e46257d9fdba2f525ab7dd3855f151662b8e42079bffa2' 
  AND token = 'TVs99veI5OLo4fUjI55p6vVWptfoE7lCRspVzNCi6Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}