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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08bc7020020ee487d395079ebe5399001ae35fb7a5d875f033e03daa95578644' 
  AND token = 'cOCubnYspqERwl5hu+cE/ZKxyee+b89cut5hoF5k458=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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