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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3bcd41ed40a9fe7ba78faa1ba1e16e7f5e116cff0db5ae6aa0c0d883d398045' 
  AND token = 'tpPVtj+aoxyBcYb8lPmKxEIiSevcALWpJhNjIwiRCC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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