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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19638fe6a36e86c6304abf96a2b3fed55c6205cccca1d269c6e2e881139da366' 
  AND token = 'JrB0sEU5jQQ0ul2pdO7AMESzU82RhhKWXvPC0aUZjqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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