SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e19f65a6312166258de7bdf3a72e5e20c450b68998b4a39645d3c501bbf1e5e' 
  AND token = 'eHINrM8GWZ1kvCDWYMEonGVJu5/y7sbSwnEgzCN++dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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