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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd154cc7c2e51efa458380e0f5418f56b08bc69f9756f965f7d26303ecd640ecc' 
  AND token = '2UyykouCgAqZHQQS4rEswCuz9eT4BdUe20tCexCsLQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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