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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feafd1b59b04a16f56ba6068efefc7df5e5f44ae4f7c88896fd9069172306dde' 
  AND token = 'aSKl+t03dMSdI/e4qzF5up/DsDRyV5MGUWEDgW84wpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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