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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7aff30c7e5c7f5058f1a022bbf1cf480986d19df54c15024daf1b2943b83803' 
  AND token = 'Q1U6yfn/9o17mCheykJbEPrT0YL454ZTzGo4adOhojU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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