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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee9f21e2a03dcdfb19d68b162e058f6f923886c321803e5459b722e0884db514' 
  AND token = 'TJsfn70/jlIE+/4ERWlZDZVk3hixUOzuo5MbOCOVMyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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