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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bb4b94596b71c49c9507aa082593e948667d8f3dd62e5f93426c000b277ff9f' 
  AND token = 'YiOw1bRt6Fj4xk0I8qyr5lQlxeKYvrNCWipkkS48dOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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