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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffe335f8a27f7a17b896d6f659a46a9b3e139abc1a2eb58626897a12743b714c' 
  AND token = 'PH9aC8IbQMAMW8kmgQxz15IJ+OfAqWVD0IoVOMbeUsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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