SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ade4e7836a62a53c874696e439c5853f16eba6243849f232e8aff82d1b46496d' 
  AND token = 'nNKiGp9Wr0e/qRqK8G+QKgNMqRbi1J68iBdvsQZwlUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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