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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b583a2706a3408cd935a845a70c3f6ecd1294d3ceba39e0391486193c896088f' 
  AND token = 'J8yJZZmzCPyz5ZsM0ZX/6VRvn0czrs4OcVWY85VSFD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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