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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbec0562efd665a4d495af74adf6b3999b9b04f490a9e22c22887149b3163c8a' 
  AND token = '1ZoqIbcQcLNZZUBJ/U5qgk4jSokVWH/Bd5bt3EEfilI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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