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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82ce6fea0a0cdc2513cef1e404c3e98b956bb990ef27775adbeb6caeef1f4fe3' 
  AND token = 'p6UAngi7U7770kD0DJewpW1mEj3YJETTDeotYIuaBAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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