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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9205bdb15f82ab3018860d75931e5fbea77460788ccc61274f84954b0380e788' 
  AND token = 'd9QO8ND3X95QlVPmK91FIQWjqPwS40NEUTPlS0DG9pU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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