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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ada0606106c7cbc6e0d7823a76b481986c5edaca2187465a719e76039bca9c' 
  AND token = '0VbBsw2iiYpfq9fApdC9/uI26Si2KLnSHWX7QudNHSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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