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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '883b7f7bb311d2d9cfc473a11063c531daaee24bb3cca5cd33c9544b6a3389fa' 
  AND token = 'czAr6RcPyHPl0LqYRbPYAJoLvuzxXvWCfHe0e+14lKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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