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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc6368b6a147b54bf99a300c949c41626670aefb3b281b8bb8bc1b82967c8bf' 
  AND token = 'tMuvwm2QS2L6aSnCiIXIlrXzHMX9G1f+Po4+PwK+zDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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