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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5fcab5055d4bba33cb018c3714a4c3ac9cd94099306b4c677606e6a18b0480d' 
  AND token = 'HhgTNLWvRumb4+0+7r83TiU/W581m4B6FyoW/ib1hBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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