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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f4fcdd45864024c5d0b934b6d7ce5cd2fb708335ab94c9cd1f848f115b7a605' 
  AND token = 'lOyceoV4tjxyx2DgqzKWZhU+ndM8c/hRoeKsUcUxelU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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