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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf082f4634f17aa26163ba47c3aba5eba32dc320f7b941fb13e0222e7ad47062' 
  AND token = 'akMyIeO7R3J0YRfjG7zczuvnL+CTk8raQMMJ1AqEyZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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