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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd09775a5a5cea07b4a5c2fca6d88fae65b24d8721be74d832039834fcdcde709' 
  AND token = 'dXg6XDYbLdDP9NR9C1k77L3yFIQek+lKgvQZLZfwf9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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