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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '816ab28afa9accad9eda44280e3c1a231a6b1015ba5ac5e2f15ef7016ae69ee8' 
  AND token = 'ltduolqqHGUNqxYxubdfjFbPIxe9VXiZrwC40g23EWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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