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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14ac6cb8de95aa872bdc19960ff6e31329ca3963744214bf94f1af7534f91c29' 
  AND token = '5R/0WrzZuSIHRsZWNq7PGpnFQASlRI7eEKzyePB9yv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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