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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa655b3896c21e34ba3b5492acd03a23864d9e4b621cbf21a3fd543794ec3b85' 
  AND token = 'rDfsK30P6fW/XBEEf+4Ril0X1V/O04x/l81kNbYdqSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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