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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97babab6c6ace66659abedb1d2884afba98ececb3538dc10026c0dbd919b0ca4' 
  AND token = 'cFc0QMPvf4KXSh6y4oymaOBgFl5gnpkVM1wgHbYjsCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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