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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff06cb1ad653696436008bd5d73b4650bc08fb33ec0ec13de5a3af2dc429b588' 
  AND token = 'iKOI8FJ0jxThJ57FWyUXjl5Aq3zqDnBGFM7NWh65URs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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