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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34b8b4831eb8eb79bdfe92d5be197545314fbef30b85f2cd82eaa3c3000e665a' 
  AND token = '5ysrnpIuVK0NS3Kbc4BVLJXnGjpVTZVzJbYl73IidkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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