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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d0025e135f79fa7dab6bc10844bdf26896bb7a92a7b01ae35ecc15c757a3955' 
  AND token = 'xk1c6D1neKn/lwqKISfSXwlY8VwCmdpbdTDlO5wfh2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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