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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcaefc46fb9c00b9b00d686030a52f648edd9ecc87a66e460d8a892a7778b404' 
  AND token = 'ajP6/szl+CziBAG/y0JxE/3c1cp70YX0l4kwn49V7gY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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