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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '634718d0f7dbf80282a68e9dda23358e215157f93fe89842912c00274cfba5b7' 
  AND token = 'yWl46Tht1QKaJNmHxdmYaVDzdks1TnOQ/M32PjN+jk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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