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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '479067837f467045ebf98fb1e714720c171e95a8a9adaf2873f2eed5140b34f3' 
  AND token = 'p6W0vDMxi0hq848OGW4KKFYkM02qUBYyym5iBX/PMD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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