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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f18ebeba1e6a04496fab2c682236c6fddd64c4ba9e3259c6cfdf6f4e668d0e40' 
  AND token = '7RmuzGhn1iBbsii5r4Gk/Yb6HrjrxK9dZ8n67fkS2bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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