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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '230b61b8862579e8448354bb84db06c462289dd9caddba055f3ef589ebb07600' 
  AND token = 'Zk4kzF0Ga7YCVU43tdZNcOWh5ZnoTKfXpmpyIF9j1k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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