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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f0d12daa8de31f8ab429593c1c1463c53a547130f4fba7bdba1dcc1c054a44' 
  AND token = 'wTlhGaUXrSstXxMqpdoPWkQjeggTg/lJ3TTHrKTNKS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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