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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3ee890d61275b45a42ec0eb07f92409c2c0d4cffcea2ee3fb86e55ea9ca6aa8' 
  AND token = 'GcJ8hgGqSeZ6z/d6Y6x0Lq6rhZUmbwP7M4oyZpx3tR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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