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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deb89ce6eae646a19c5bf580d6da4423782256baa03f87f72f409c5ecbc32841' 
  AND token = 'srJ86GWClE/wPmnWt2rn+uk2bP36rM9T29iqdJiOf8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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