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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a49ca90c3e4f4c7fbfd87c888fc82cc9a7978696d8ab2662f800cbeac6be28b' 
  AND token = 'ub4VGRXKlFY67izaSo5NNzxzHU1q/K/yOva85s2v2bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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