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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65996d5f2713a01a879a087ed6816bb8f0522c40b505799a632ea166738cbe4c' 
  AND token = '0MC+z2JIcrxrqDq8HFsnxObtDeZOWphYdm1L3zD0t68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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