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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91390533ae210bfe9571fe2334d03fa7de93ed557b966c8f7f5c9338336f5550' 
  AND token = '89FvxonU3ZtUReNqgcTMbPs8DOEx1xUu7xjTb6BBXnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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