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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '971a17eab43a5e7854c75af23c0b7ae9655ccd66f84e9b24d25995a1531ab44a' 
  AND token = 'gbnqM2XCBvdn9Iggb/OdVE61gVoYIlZwGBtTkIclkuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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