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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '131f1930584c26320d18ab95bbba45d260033a3406d14be9d9cdc570667f2062' 
  AND token = 'C/HmzXThW11fL+Z9dIfw62NmqvcW4t5liiJPFio3yj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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