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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7958142fbb67baba0f4e71677a843b9cdbb58ed6525f5afaa8a7ea55458fb17' 
  AND token = 'DwiBl9i775BxlZddhIifHmci2cYWzf9H6H4Qy1v5aho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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