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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4069d3ef8d54a6ac411ef715756ce945a1bf83102c5175e57da939fb097a80d' 
  AND token = 'ZMW2nHJrrBBG3k+lMUlP2xr26vcIxl98e5Tivek/iWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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