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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6b01237de4d8f91ffdddc39146a06ef0968cf502f2ee56ac1d073b9ced82201' 
  AND token = 'P5TF39D7oti91H4smjzHcaYW355of5mUaRqssBS7/kE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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