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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff12f4bb63a361e19b9040eedd5630c472b5092debe9d16de2ff5d401bc50c2b' 
  AND token = '7TxtnnBVG2Xgfi/CemM+fAquskEJ8Y6kuvhbhx6eylU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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