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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae5a67f718c9ed2538c43f37dfb1d40642fb4cd83e8d96d634a89df291108fa1' 
  AND token = 'aBqtaTTtOyZjxofwH1WLaYSVBqFMfabtvb8jmbxXfaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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