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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9754143682a42ff514a242f679e839fc83120a4cd99ebaba4a84324bb95322d' 
  AND token = '6wWI19HaKESoQGBOQ/DYdvSvcadjP83CaMHE9r4dIxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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