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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e14ed5ebc3a43f6b51584dcf52ba810af9f1ee853318669a2a794b064439f9ce' 
  AND token = 'tAR+PE4zeqYiQlkqu4iqOeqKvDLMjpMDn1ifw6pcE9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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