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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed150fed585634b37c6d6b8d346bc4a590366359bd0fa368ebdae6ae4246e82f' 
  AND token = 'hGwS7d8atvNESv2I2uwVgUaX3iJXHvfTbY65+XUMirs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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