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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ff9eab41937dd6fee5f3f65bbb22333eb1f2a8b463c1f5d2448e10c8cfc0e38' 
  AND token = 'm3sAdSLRUX9ohLxvpVGMwZb424+rSiH6WLOFdColzqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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