SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '070552b75ec447ed0f1a1de7227dc35f8b5bb5367639f9c07151e9bd86992b19' 
  AND token = 'QzGz73HypPKjAYnB0DhdgfiY6HMlJIvv9AVWozZN/w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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