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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cce64fa9b231b6a5bf8d31eb2b7bca6e92e5627b0bfe18ce67d6eee9d27c39c' 
  AND token = 'wqvQ1DVW6tYdI4Y/kVoO3JX+xlrr1Z43CGFUoU9Nq4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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