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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cb1d567e84d65a5323d9a7c17382c7b2dd4283cc78fe07ee7c02bbff54df30f' 
  AND token = 'MstxsnS8ue9iGImGkmV+o2ikIS2rYqWUy3z4nrPRBwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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