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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b1af0e9aeaf1410b523a474ff3c9995560de9702e13ce7932f63d911c3443b' 
  AND token = 'bvt7HNEcwgsT0/0S6WmshPyAfKplQIZ5+V2N7aHysds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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