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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c1cac546ab4d37670c3c84f6773464e9a58862e7d29b8f9de8dfd31065d34e' 
  AND token = 'lnHBRxyy/FRusQq81GRd6jD9pMWavJ2VFgn9mI6kNxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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