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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adf954870cea81c5d016497463a7585f123da4448c6f9288339e3a3a69cef1ba' 
  AND token = 'tpyJ3SI3eFf7RZVeisgZs5aeL7eaqh9ckreVtJv7J+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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