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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf930d5f4b5fc61e8fefcc830926f1b6831045c64469f67c851deaeb59a1e3b' 
  AND token = 'TeHOyMNJCCBD+VWPJ9eZr/J4KcKVEz2yUV+zsJokLTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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